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Our features are coded for by GENES, which\nare found on CHROMOSOMES.

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All sexually reproducing organisms have 2\ncopies of every chromosome one maternal & one paternal copy

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Therefore they have 2 copies of every gene-\nthese alternate forms of a gene are called ALLELES

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If both alleles of a gene are the SAME- the\nindividual is HOMOZYGOUS

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If both alleles of a gene are the\nDIFFERENT- the individual is HETEROZYGOUS\nfor this trait

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The allele combination for a given gene is\ncalled the GENOTYPE

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The physical expression of the gene is\ncalled PHENOTYPE

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The phenotype is determined by the genotype\n& environmental influence

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BIOLOGY